Michael Bublé recalls the day he made beautiful music with Reese Witherspoon. Literally.

Whille chatting with Ryan Seacrest on his KIIS-FM radio morning program, the Canadian crooner explained how his manager came up with the idea of collaborating with the Oscar winner.

"We loved Walk the Line and her voice was so smooth and wonderful," Bublé said. "So my manager said 'Call her.' And I said, 'I don't want to put her in that position.' Then my wife came home and told me, 'Mike, we're pregnant.' And I was so happy I was like, 'Today's the day, I'm going to call her.'"